The trees produce the most pods when they are ten, but they are still productive long. The workers use large knives to cut the lower pods and long tools to remove pods from high on the tree. A half gram of chocolate requires about four hundred beans. The world cocoa foundation says an average pod contains twenty to fifty beans and growers may lose perhaps one-third of their harvest to diseases and insects. But now scientists have genetic maps of two kinds of cocoa trees.
https://www.youtube.com/watch?feature=player_embedded&v=5WmODuDorAA
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